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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c26782bf1f4826cdff899f61291a6a4ee48e40684b52ede142f9a85b43788f4' 
  AND token = '79Ra103h0OlFGzmTTQJJDc5jtCneuLEtHaweZGNjwCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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