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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7b2e18adcfd68784f2c3b8f00b2ebc5c0dc58b9f53f8369b3b1daf0137bc796' 
  AND token = 'Kd6qTNNSvp8QBLFZ735E1I+bYEASMrLEw+yXUXBDhEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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