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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cc7c282c751cdf51afef005737283e80efdee9c817d091bc2757e338a242ded' 
  AND token = 'Tb7VfW9E+0ALNrJa4Dt9G767S+nm9WKCsVw6pTKWHmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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