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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b4ccc792e208d94a05e240a266e13daa63fea07b242f9a85c0e018c1b164881' 
  AND token = 'Vd1qxASUyRwYW2yASlvWLFRwq0FX927+XgV0YaGNdVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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