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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6803302d7a8bf79258da1d497d0fbddd517fd2993942b37be766144d658c30aa' 
  AND token = 'IzpkZroRq/LJManC4wJOMl0tWBUyuUdmR3KiprvAR94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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