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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7860e9757a179379e9f50a7afbcb0dee58eb7ce6a16edb47ac4ba63138a5800b' 
  AND token = '6WZIhn8dlOlhEH1O79xe9SNIbOzW19LZamVGokkErVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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