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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f886757742e5b3a53a0356b0ee29cd5425f0b068ad270a9ebbdd0e69d216cae' 
  AND token = 'cA358cfSkJF73URC6ZuECkmGxH26mSfQhVKgeNfWkn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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