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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '660f708ebdcde5f1610f06aa6f987cece8876b22c21c90bcb43e385f31e0d2fe' 
  AND token = 'OW09DTHdG+oY1Zg16JCLUEj2sqj6F0kfZdwGMLb/050=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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