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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6641f959e43cf03b7b41ac8032d4879efa329e6b276b16044ae4372211704412' 
  AND token = '5pLkZ7H8GQfNN8SS6cVaH2ILgj3DGoznRrRmxo0k3iM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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