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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9fad7ca78de2095ad210c9aa4ef7d5c266ba6ab55b19db0594aa6631a6f5a65' 
  AND token = 'F5IpLf6xPm47dO0D20pQKKwp/6tqcFFIk5vbhf12KsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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