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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbe44711eb82746aca13188af84815e3c32ae83c151337a627a71fde35d861e5' 
  AND token = 'Eeub+Jsml/kHoTrTImCpUdEp9sZ2zRXtT7H6jjVViF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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