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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf589a6b585c28a155fd90aedb267f18f3602d4a24bcff27fd85f9bc929598e2' 
  AND token = 'Qm8GhLcTj5ytIuCjcQLywrC4Bxl8H1cTcKPRieaUbvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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