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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d433e6b6a6bddaae6e84da8f7f3b47d8b4722242adbcb097323b1fb7f7967b1' 
  AND token = 'G99uiT7r1c2i/q233Kp7ptdlobtVrc0VBxJcfNx0uYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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