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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b97d48907aeafcff4872ec7ab889ff4ae8b0c36972036e0646eb887252a55ee6' 
  AND token = '34E9BiF6WJEmY/ejjyFXEv9MsnCwo4se87q7uHEzrtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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