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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '695b91eadd20a591ee97fc0107b1ae3d025ad1ab6a880363f755108aaee0f89a' 
  AND token = 'hNXvXLFPTRbEC+7wfjNNIZ86gUBbG4ZsNlR/pGHfo1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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