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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ec066f905f0bdf04006e273fcb0b07509d44ed0aa9fe41209338db987c726c9' 
  AND token = '5HjGx5/j/NJSktU9m6MlpgOnhBk8hRl/JiQc4RF5gqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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