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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33177d03c7add03aec0f9c7a4b0ae27e89d2750aa2720acd4043839d53035d0a' 
  AND token = '8+UiQEdCqPiF1sIb7foizbWo373kkdyBeI7RgP+ofPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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