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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5df4fb604db01edde8b7b248c74df338d21b45a8acb00fba86ea9aa5a95fb0b6' 
  AND token = 'B3Baf9+SFcJ2fQFRu00Bwwv3A32VLS0Cck2U6MRPEnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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