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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94333aa40a0cef729ed7b8d054bcdf44ed7f3a8477016c7e77751125f52e5939' 
  AND token = '+ltNIVnk6tSa/1ImCR9yb64KITOb1VFj9E7drGT+LmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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