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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b63ee076f78f743ed3b1c40265c8cf2f22cc8bb8a39030c3ef4199023470440' 
  AND token = 'fN9anoZDihxaD9JOdUdRcOBN6zvp2UU80S2O8hIWJps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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