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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '263231e1bdcb79b2fcf433a3f405e1f182afe3d616d1331004fc55b33dd1921c' 
  AND token = '7QHAf/zXhX5noSpVp/JuLd76M2/2kkwjkP80cWf9vMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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