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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03ab2e617d94ec9085304ba051197ab1bfb4d7bb54ed83661242a4243a7266a9' 
  AND token = '4XZTsfLK3BuHjFI16vv3ccIhfJyqe5ytIGyWW6nvAhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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