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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0645ef7d8bcfbfa7599bb5ccc8731d6e6a7a584ef78aae34df4ef37c6595ef3b' 
  AND token = 'hicwPCFdAlzFiY9ipOf+j/k99ml/lrwKR7uBltr3y5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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