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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd16fd3301768ae38639a24116cd7e8aa04fa49eed7fe0f1aed65768a92b897a' 
  AND token = 'Fu80/Gnv+mNnXus+/HK6ITjiD1oAjeXk4itpru4DF88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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