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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ac67927632ef1b1889943c0f1c046a3b1e2bd770b35302b1c4964df72925919' 
  AND token = 'iUGUFoW9ehBiIC6bkBckqetp9j6roPm3d7yNX34cw30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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