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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b31e8e4ce9eded530c7a2c4f8e2abf470f69ff19f3f85efe6947ba77b05fb4a' 
  AND token = 'XG1veZrD9bRhQN7DXq5o7Vf0oqc5CLjzFaSUmwQQe08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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