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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc3a80d3cf0832d01c3bbbf4cea01117bc5ee4e4e87d51926948d0e42e2a8ddf' 
  AND token = 'tUqR5SWOsHxkOz5KHUcJCKjraVn4SLTuY8S5vYWQbwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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