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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e4cfe45c53aa7762110c84b9cd71a1405ef821dbf09b5dc9d056165b40da150' 
  AND token = '9fRjkUmRn6VLLJRMnBsjmAGesWsp7waL38q7IKQm0C0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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