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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11cffc390dde1fe6870be68b66fb2e970aadf1b76e108cc4c303232abe494fd5' 
  AND token = 'bwoR4l0JZ441kf8yT+xsLP5J79+iOaGXHcf/i7+XrIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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