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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87c4c98c853008975b6b4a4910a53272fcc8b45157a976132098abd95c30037f' 
  AND token = 'DNJ5W8VHvjUT/MdP850MjLqTjF5EZnqQq8owybvACv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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