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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '877abdaf374c5ef43194f99f78971395765aec25f63032d6af00056df60c4d6c' 
  AND token = 'jU0320SinL426ItryaOzcsu4nYRgXdxtwNje0nZA45A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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