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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '704c8a90fc8469c0ffeb2968be503746b0355f570d2fe371eb0bac79fceae7ae' 
  AND token = 'nL+as3jCv8NFy/bKm+8hTWq8/0k8r9HBPE6duw00O9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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