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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94282cae7567ab7631b2ff1f7aece5918d8a19daaf64f61f028bce13a9a8dd3a' 
  AND token = 'XpAwt+danYN/TbVyuHJ35xZZx8wNiiR1y8+C2ZlYTjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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