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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aceeccfeadeb569f53a0db0f6842054f39800fefc4953f0a2f72e31bd6bf0c69' 
  AND token = 'JneoZ3l0iMcfYv16Dj5BfZn+UurCBN3b0Ia+K/XymNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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