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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd880f37c31f06777cc6ce626e601b6a90c2789e473820d4cf94b7135b5d11698' 
  AND token = 'VrqVJy772+ghjjXN4laX6ojNO437KCLDhyut4lQ1uDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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