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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57a3379f06319ed77f999cb1af64b655a290d2bcece47a8e5bb3de7dda9f702d' 
  AND token = 'C7GoJbMeAwcFzRBv/TwztSplve4sJz9l6dlZlkNZwgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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