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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98be9f711a679d246ac8fff63719206fb999a1636f9e6abf97d6f524fb05b2b6' 
  AND token = 'IFjwNVBOmb5+6yO37u6DJxy0xiEKuiFG1BgnJH5VKV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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