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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95032326598de86dd7928bce6d7f18fb3b7a0121bab459a228c58c0d8de2c47e' 
  AND token = '8ymYoQV6mScJ147zj61ottF2b7+qF6klQvHYAqAjU7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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