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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04a794b43660afc88f7ef4c9ced0832b5364b0ea7c336f3258b9ef1344d89afa' 
  AND token = '04Bd+tNtjfrWRMVntEUbdRDUUEAb8qEq3NAJRwNkgvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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