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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cbdb602db265af37f153a4884d4ce3b6c1c9ea58709a30d76995f2173d7ea74' 
  AND token = 'bBjZRaACS/u1WCqSZJEw3WbXb8fe9ddcud92qgaWOqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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