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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e13adbd9eebee3d068ab2d14d200b66cba31e44dc5269c361816f7e8e1c44a87' 
  AND token = 'RFppDhoAYAojCy8z5U34hMubs8G3RGIpUVgTyuk5gpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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