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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4277a177c8fb8a5c25db4cdfad37b63a561e1bfa84b06c7269e2193aa4e2581a' 
  AND token = 'YHtUi57Ei1MBdRBTti8759QnxHnQls6AceIsBmIvUws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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