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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fab1118e60443da8405f8017de4ea9d013fd171ae6c1f721baa4152ff600314' 
  AND token = 'OfyT3jqhvslUyJ8bsRYGc0AJg7JvfPf+bLIMsmdqkok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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