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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d4f73dee87b571cad3a8a0cf22ab0b3e2ae15dd7ad925adf8bd085e45a5e5ee' 
  AND token = 'bncB3DYw+gHBYzCFU/TMU+K8ZD5usuSDZPHrrDBJE1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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