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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7bfd4cdf93fb6d9669ccf47cdfb8f7139af19cb53ac884bc225ca4ed2f6633b' 
  AND token = '5AT13wDWYepz2aEE5Cn7UkhS3ton/JtafDHXTlnYgyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}