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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adbcf7e0374092e030ad87873d716bb4151b27de11baa3e145f68b3da1dbf7aa' 
  AND token = 'FVRh6Ah8gFSHuP/yRKO3e/dsdgPmrSDT6d8trlMa4CI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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