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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb25f5467a67e3112c8fc0625377c3ba5fdd693c05989327ef41d64147acb098' 
  AND token = 'i9dNqdKjQnpVaAXJxxbv0pZJGI9X1lp7qPNcXkoXJro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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