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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cda57721de175a24c1cfd063af8e1b4754eec55ffca6f78e877ec218a5940bb' 
  AND token = 'bCvCnx/pNuhKPth7RCSFn68nq376k0IXY3hV/Dpt9G0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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