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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '758a577c633e19935e798d09d91745e223cf5001294152c790863f5a4dac258c' 
  AND token = 'tydYIe404ri1IoYtWJBwB9FVtQvyE0mWbU8RfBJfq84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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