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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5ba5ba5e1adf8a162ccfd1947708a91ee4353feeb9d6a8e982e127cd87416ee' 
  AND token = 'uhDU1yuhD/grRxDFrgEYla0B3DwtJSnrE3TI6mf8lnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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