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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57530d3d9a87a1b6ccfe8ba8e18e4d17b97df0d95f4adf57143a9a9ab860f775' 
  AND token = '/YZ596TORJAhmNIG5xmFW1MmvWRT5TNieC/UrKykS54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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