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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '236c0f33294a0cb74fe5427066e3f9cad3dcd727efcb360c8b7806f6038a349d' 
  AND token = 'ozoUdi4iKOjLo4ybYX7CJnIl3X/C8BWD1Qix+CONZmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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