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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55a4700596a12ad92dfea6a35277b2e755a42abd59057d5d51f9a2cd0df79e9e' 
  AND token = 'sVIGdTrSbkaoHdGkpgc6Etky/tDaJiR9JPmZIS8iANE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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