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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f99c741a69756e9dd7aa5403b146867e3a4bae5be701caee454a0b961f665529' 
  AND token = '3ptEDixzQIRYzsh8Jx7exF8pbyaNB8i9JOIhTo3z1m8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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