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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f92db097d727eb7e9bd87ad11656fa38151097770158603a35308170338ee57' 
  AND token = 'V8FatniiUEXCSVfquoBSjCg8i/G740Wn4y8rSMJfbWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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