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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '505edb29d31b7e39e57c92a2adfae0fb8a947c263d5dd0533b882fbb63c752a7' 
  AND token = 'm/ogBIkG56C+kgxO2xUHb+46yjrm6D8/tlaVcjmOWs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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