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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0983575df5f0bd648bd6c7d62506fd0aa481bccdb29eb0f4a28c4bf615c3e15e' 
  AND token = '65PuzZldNUwkSfkJZPgwUUmosN9Zv8xZm4aQDgPJZTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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