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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddceb015918050826c477ba0f508fb0915600906de61effeae9d8ed15b59fe6d' 
  AND token = 'A8j+Owwj0qC8fVCLoQWUiwbC3F0r7M1yMPxwE6XQnX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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