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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '088f8068688cec3abb1ec1b7964eb7fc0e06b2ab028cd559f6931689b3b662f2' 
  AND token = 'dvMFf4TIprlbBBH5L25ueA0pyz+tKMP9H+0UbM7wjRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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