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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd623e69803e6687f9f49f692f648cb77dc8c8ccf40a7ae67bdf503503b833240' 
  AND token = 'Jit1Z2mXCU8xEiKkG4eTnrcnYdXtPKofds5+bwSHrmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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