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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3728085c0235bfa8f652ab22e76890d5390ca2f68cfbcfd00f871d1dccfcb8a7' 
  AND token = 'R6cwcByC1bo5V08nyEteIHNog1wqnjY7r8xeZMPifcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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