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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdd01c0661099d90543a29aad7fed9fee46a26adf213a89aff026ef0e39386e0' 
  AND token = 'paKyor8W6zs54bvUgVZpvEDrkCunk3mTkSvJ91v6jNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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