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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bba0894f62c162eb3bd1b06ba8a0a4927cd7815fd9f864de6cd53fde71359b52' 
  AND token = 'wMMS9iWO8hZ7Q7o0H4MPHAvvoF5OlN6p7qSMHnxfZ/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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