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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c38a53e0a486e16c40749a038f7342c4ade64b3d01e03ce4922e5797977140d8' 
  AND token = 'W7G0/34+4qtNV/Izxq1z2I+79Ha8aXClo1BWt1xttGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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