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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f24197f15b37c5284b58c6afbbcc3261448323cac950d21fc6cd024011498b51' 
  AND token = '0TUB8NPgTfjHBk+x2gRB3AQUgVtsG19xvR6FUli4cqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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