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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '803741613331e690971733aecd116e45555a76a8af21209c6d94df931af867a6' 
  AND token = 'zr/utAgEBPNeCzxKBQOAsZTo5e1kNLr0vVmrO+cyx6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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