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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82c85c20983132f30b8bc33a73c7e3bdfe97a2e7b1e011414c776e8dafd222a2' 
  AND token = 'b83juW/QhO3wz/nZm9+yYigL7OnClCnu1MY+IELaNJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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